Refer to temperzone for recommended
thermostats.
It is recommended electricians run a spare
wire between Outdoor Unit and Indoor
Unit in case 'Indoor Fan Off During De-
Ice' becomes a requirement. Leave this
spare wire unconnected until required.
(Not required when using temperzone
SAT Controller). Refer indoor unit's wiring
diagram.
A 24 hour power supply is required to the
unit. Disconnect the crankcase heater if the
total line length is less than 8 m.
SYSTEM CHECK TESTS
1. Leave the remote switch in the off
position and close the mains isolating
switch.
A four hour delay period is required to
allow the crankcase heater to drive any
liquid refrigerant out of the compressor
oil. Bypass the crankcase heater
thermostat (CCHT) for this period only.
2. Check that all fan motors are free
running.
3. Check tightness of electrical
connections.
4. Check that the thermostat is correctly
wired to the unit and is set at the desired
temperature.
5. Check that the air filters, if any, have
been correctly installed.
6. Check any supply air diffuser dampers
are open.
START UP PROCEDURE
Use the supplied Commissioning Sheet to
help you complete the following procedure:
1. Switch on the unit after the four hour
delay period has expired. Ensure the
crankcase heater thermostat has been
reconnected.
2. Check the supply voltage.
3. Measure the current draw on the
compressor motor and on each fan
motor. Check all readings against the
specified values - particularly the indoor
fan amps if the unit is installed in a free
blow application.
4. Fit gauges and measure the suction and
discharge pressures.
Important: Gauges must be designed
specifically for use with R410A.
5. Test the operation of the high pressure
safety control by switching off the
outdoor unit's fan.
6. Test the operation of the reversing valve
by running the unit in both the heating
and cooling mode.
7. Check that the air flow over the outdoor
unit's coil is adequate and that the fan is
running smoothly.
8. Check the superheat - refer charging
procedure.
9. Check the supply air flow at each outlet.
10. Check condensate drains for free
drainage and no leaks.
Pipe Length Capacity Loss
On Cooling Cycle Due to Pressure Drop
Note : Loss percentages are approximations only, due to piping variations. No allowance made for vertical piping.
Charging
The unit is supplied with refrigerant
HFC-410A (R410A) which is sufficient for
up to 10 m of pipework between the indoor
and outdoor units; refer wiring diagram
specification table for amount. Add 45 g of
HFC-410A per metre over 10 m.
Procedure:
1. Evacuate Indoor Unit and
interconnecting pipework to a pressure
of 500 microns and hold for 15 mins.
2. Add refrigerant, if needed, via the
Schraeder connection on the smaller of
the Outdoor Unit's two service valves.
3. Open the service valve at the Outdoor
Unit to allow refrigerant to flow
throughout the system.
4. Leak check all brazed and fitted joints.
IMPORTANT :
Step 8 of the 'Start Up Procedure' requires
you to check that the superheat on the
suction line (where it enters the Outdoor
Unit) is between 3°C - 5°C on cooling cycle
with an indoor air temperature in the range
21° - 27°C and outdoor air temperature in
the range 24° - 35°C. If the conditions of the
day do not allow this, use the heating cycle
or other heat source to raise the indoor
air temperature to about 24°C. Return to
cooling cycle and blank off the outdoor
coil to raise the head pressure to 400 psig
(2760 kPag). Alter charge up or down to
establish correct superheat.
WARNING:
This unit is designed for use ONLY with
the refrigerant HFC -410A. The use of
other refrigerants is NOT authorised or
approved by the manufacturer and may
cause operational problems such as poor
performance and efficiency, loss of capacity,
degradation of materials and refrigerant
leaks. The use of flammable or explosive
materials as a refrigerant creates the
additional risks of fire and explosion
which may result in property damage,
personal injury or death.
Oil Charge
For line lengths in excess of 30 m, Idemitsu
polyolvinylether oil (PVE) should be added
to the refrigerant at the rate of 10 ml/m of
suction piping. Note: As an alternative,
mineral oil or polyol ester oil (POE) may be
added, but no more than 65 ml.
ELECTRICAL REQUIREMENTS
Electrical work must be done by a qualified
electrician. The outdoor unit must be wired
directly from a distribution board by means
of a circuit breaker or H.R.C. fuse, and a
mains isolator provided - preferably close to
the Outdoor Unit.
Note: DO NOT USE REWIRABLE FUSES.
Standard units are suitable for use with
thermostats with either manual Heat/Cool
selection or automatic changeover subject
to the contact ratings of the thermostats.
11. Check compressor compartment for oil
stains indicating refrigerant leaks.
12. Touch up all outdoor unit paintwork
damage to prevent corrosion.
OUTDOOR UNIT CONTROLLER (OUC)
The Outdoor Unit Controller (OUC)
includes a temperature sensing head
pressure control which enables the system
to compensate for outdoor ambient
temperatures below 20°C, and heating cycle
above 15°C. The OUC also has features
which protect against icing or overheating
of coils, rapid cycling of the compressor and
loss of refrigerant charge.
If the outdoor unit fans take some time
to begin rotating when the system is
powered on, or they don't appear to be
rotating appropriately while the compressor
is running, consult the OUC label on
the electrical box. If necessary, refer
to temperzone for further diagnostic
information.
MAINTENANCE
Weekly For First Four Weeks
Check indoor unit air filters (if fitted) and
vacuum or wash clean as necessary.
Six Monthly
1. Check the tightness of all fan and motor
mountings.
2. Check the tightness of electrical
connections
3. Check that fan motors are free running.
4. Check suction and discharge operating
pressures.
5. Replace indoor unit air filters (if fitted).
6. Check condensate drains for free
drainage.
Yearly
1. Check all refrigerant piping for chafing
and vibration.
2. Check the operation of electric heaters if
fitted.
3. Check air supply at all diffusers.
4. Check for excessive noise and vibration
and correct as necessary.
5. Check for insulation and duct damage
and repair as necessary.
6. Remove lint and dust accumulation from
outdoor coil fins.
7. Touch up all outdoor unit paintwork
damage to prevent corrosion.
NOTE
The manufacturer reserves the right to
change specifications at any time without
notice or obligation. Certified dimensions
available on request.
This pamphlet replaces the previous
issue no. 3552b dated 03/11.
OSA 83/95 wiring revision D and J resp.
Pipe Size (mm) Equivalent Line Pipe Length (m)
Liquid
10
10
Suction
16
19
5
2 %
1 %
20
8 %
3.5 %
10
4 %
1.5 %
15
6 %
2.5 %
30
12 %
5 %
Additional Pipe Length to allow per Bend
16 mm
0.3 m
19 mm
0.4 m
Suction Pipe Size OD
Long 90° Radius
(2 x pipe dia.)
